DIRECT VENT - VERTICAL (CATEGORY I)
Figure 8.
TABLE 12. DIRECT VENT (VERTICAL EXHAUST CONFIGURATIONS)
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| APPLIANCE | CERTIFIED | EXHAUST VENT | MAXIMUM | AIR INTAKE | AIR INTAKE | MAXIMUM | |
| MODEL | CATEGORY | EXHAUST VENT | SIZE | EXHAUST VENT | MATERIAL | SIZE | AIR INTAKE | |
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| MATERIAL | INCHES (cm) | LENGTH FT (m) |
| INCHES (cm) | LENGTH FT (m) | |
| I000 | I | TYPE B OR | 10" | 35' | GAL. STEEL | 8" | 35' | |
| EQUIVALENT | (25.4 cm) | (10.7 m) | PVC, ABS OR | (20.3 cm) | (10.7 m) | |||
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| CPVC | ||||||
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1300 |
| TYPE B OR | 12" | 35' | GAL.STEEL | 10" | 35' | ||
I | PVC, ABS CR | ||||||||
1500 | EQUIVALENT | (30.5 cm) | (10.7 m) | (25.4 cm) | (10.7 m) | ||||
| CPVC | ||||||||
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| TYPE B OR | 14" | 20' | GAL. STEEL | 10" | 20' | |
1850 | I | EQUIVALENT | PVC, ABS OR | ||||||
(35.6 cm) | (6.1 m) | (25.4 cm) | (6.1 m) | ||||||
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| CPVC | |||||
2100 | I | TYPE B OR | 14" | 20' | GAL. STEEL | 12" | 20' | ||
EQUIVALENT | (35.6 cm) | (6.1 m) | PVC, ABS OR | (30.5 cm) | (6.1 m) | ||||
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| CPVC | ||||||
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| TYPE B OR | 16" | 20' | GAL. STEEL | 12" | 20' | |
2500 | I | PVC, ABS OR | |||||||
EQUIVALENT | (40.6 cm) | (6.1 m) | (30.5 cm) | (6.1 m) | |||||
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| CPVC | ||||||
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•Connection for the appliance exhaust vent to the stack must be as direct as possible. Maximum and minimum venting length for Category I appliances shall be determined per the latest edition of the National Fuel Code (U.S.) and
•The vent should be installed so as to prevent the accumulation of condensate and, where necessary, have means provided for drainage of condensate. The horizontal breaching of a vent must have an upward slope of not less than 1/4 inch per linear foot (2 cm/m) from the boiler to the vent terminal. The horizontal portion of the vent shall be supported to maintain clearances and to prevent physical damage or separation of joints.
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